Washboard for washing machine



FIG. 1 is a perspective view of a washboard for washing machine, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view thereof in an environment of use.

The broken lines in the figures are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a washboard for washing machine, as shown and described. 